| Rock Unit | Depth, Feet |
|---|---|
| Surficial Deposits and/or Gubik Formation | 20 |
| Nanushuk Group | 100 |
| Torok Formation | 2950 |
| Pebble Shale Unit | 7230 |
| Kingak Shale | 7480 |
| Sag River Sandstone | 9845 |
| Shublik Formation | 9905 |
| Fire Creek Siltstone Member of the Ivishak Formation, Sadlerochit Group | 10395 |
| Ledge Sandstone Member of the Ivishak Formation. Sadlerochit Group | 10600 |
| Kavik Member of the Ivishak Formation, Sadlerochit Group | 11100 |
| Echooka Formation, Sadlerochit Group | 11295 |
| Lisburne Group | 11445 |
| Endicott Group | 14550 |
| Basement Complex | 15320 |
Data Source:
Table 15.3. - Total depth and depths to selected stratigraphic horizons
for Government-drilled wells on the North Slope of Alaska., in:
Gryc, George, Ed., 1988, Geology and exploration of the National Petroleum
Reserve in Alaska, 1974 to 1982, U.S. Geological Survey Professional
Paper 1399, Pgs.322 - 324.
